body main {
  width: 100%;
  background-color: #F4F4F4;
}
body main ul li span {
  display: block;
  width: 100%;
  font-size: 2rem;
  line-height: 5rem;
  text-indent: 2rem;
  letter-spacing: 1rem;
  border-bottom: 1px solid #a5a5a5;
  display: flex;
  justify-content: space-between;
  padding-right: 2rem;
}
body main ul li div {
  text-align: center;
  display: flex;
  flex-wrap: wrap;
  height: 0;
  overflow: hidden;
}
body main ul li div a {
  font-size: 1rem;
  line-height: 4rem;
  border-right: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
  display: block;
  float: left;
  width: 25%;
}
